Diaphragm valve

FDV-DH series

hydraulically-operated

actuator control

for water

* Hydro-dynamic pattern design ensures high flowrates with minimum head loss * The valve trips open automatically upon a gradual release of water pressure from its control chamber. The trip is actuated by a pressure drop at the pilot line, due to a flame heat that caused one or more automatic sprinkler to shutter open * Soft closing upon pressurization of the valve’s control chamber, by line pressure or other independent water source, prevents surges The FDV-3W-DH1 3 way control principal assures the deluge valve full opening with maximum rate of flow and minimum head loss. This system resets to stand-by close position by shutter open sprinkler replacement, and re-pressurizing the pilot line. The FDV-3W-DH1 Deluge system is actuated hydraulically and resets remotely. When one or more of the wet pilot detection line’s automatic sprinklers is subjected to flame heat and shatter-open, the pressure at the line decreases. Consequently, the pressure at the 3 way actuator control chamber decreases too and the actuator change state. If at set state, water from the valve’s upstream passed through the actuator and maintained the deluge valve close, then now the actuator drains the deluge valve’s control chamber. This causes the deluge valve to open fully, admitting water into the spray sprinkler system. The Deluge system incorporates an emergency valve, bypassing the fire detection system for manual operation. Designed for vertical or horizontal installation, the globe pattern, line pressure operated FDV-DH1 valve features a direct elastomeric diaphragm seal,